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<p>Nutrient uptake status dominates phytoplankton biomass and community structure in the Southern Ocean during austral summer, yet how nutrient utilization variability responds to phytoplankton community succession is still unclear, partly due to lack of data spanning the entire summer. In this study, nitrate, phosphate, and silicate combined with temperature, salinity, and apparent oxygen utilization (AOU) were analyzed along 45°E in the Cosmonaut Sea during December 2019, January 2021, and February 2022. The variations in nutrient utilization in the euphotic layer were studied using biogeochemical tracers, and seasonal nutrient depletion was also estimated. The results showed that nutrient distribution varied significantly from December to February. Significant positive correlations were observed for nitrate and silicate concentrations with salinity and AOU, indicating that nutrient distributions were mainly influenced by water mass and phytoplankton production. Increasing Δ[N*] and decreasing Δ[Si*] in the upper 50 m were observed south of 63.5°S from December to February, which possibly contributed to a progressive shift in dominant phytoplankton population from <i>Phaeocystis antarctica</i> to diatoms. The seasonal nutrient depletion generally increased from December to February. Moreover, the consumption of silicate substantially increased compared to nitrate, indicating that the abundance of diatoms was increasing with time during the austral summer. Our observations suggest that nutrient utilization status is closely related to phytoplankton community structure in the euphotic layer of the Cosmonaut Sea.</p>

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Monthly variations in nutrient utilization along 45°E transect in the Cosmonaut Sea, East Antarctica during austral summer

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Xufeng Yang,
  • Dong Li,
  • Jun Zhao,
  • Cai Zhang,
  • Changfeng Zhu,
  • Shunan Cao,
  • Guangfu Luo,
  • Gaojing Fan,
  • Yongming Sun,
  • Ji Hu,
  • Haifeng Zhang,
  • Peisong Yu,
  • Weiping Sun,
  • Jianming Pan,
  • Jianfeng He

摘要

Nutrient uptake status dominates phytoplankton biomass and community structure in the Southern Ocean during austral summer, yet how nutrient utilization variability responds to phytoplankton community succession is still unclear, partly due to lack of data spanning the entire summer. In this study, nitrate, phosphate, and silicate combined with temperature, salinity, and apparent oxygen utilization (AOU) were analyzed along 45°E in the Cosmonaut Sea during December 2019, January 2021, and February 2022. The variations in nutrient utilization in the euphotic layer were studied using biogeochemical tracers, and seasonal nutrient depletion was also estimated. The results showed that nutrient distribution varied significantly from December to February. Significant positive correlations were observed for nitrate and silicate concentrations with salinity and AOU, indicating that nutrient distributions were mainly influenced by water mass and phytoplankton production. Increasing Δ[N*] and decreasing Δ[Si*] in the upper 50 m were observed south of 63.5°S from December to February, which possibly contributed to a progressive shift in dominant phytoplankton population from Phaeocystis antarctica to diatoms. The seasonal nutrient depletion generally increased from December to February. Moreover, the consumption of silicate substantially increased compared to nitrate, indicating that the abundance of diatoms was increasing with time during the austral summer. Our observations suggest that nutrient utilization status is closely related to phytoplankton community structure in the euphotic layer of the Cosmonaut Sea.